<template>
  <div class="login_container">
    <div class="login_box">
      <!-- 头像区域 -->
      <div class="avatar_box">
        <img class="logo" src="../assets/logo.png" alt="" />
      </div>
      <!-- 登录表单区域 -->
      <el-form
        ref="loginFormRef"
        :model="loginForm"
        :rules="loginFormRules"
        label-width="0px"
        class="login_form"
      >
        <!-- 用户名 -->
        <el-form-item prop="username" ref="loginForm">
          <el-input
            v-model="loginForm.username"
            prefix-icon="iconfont icon-tubiao211"
          ></el-input>
        </el-form-item>
        <!-- 密码 -->
        <el-form-item prop="password">
          <el-input
            v-model="loginForm.password"
            prefix-icon="iconfont icon-mima1"
            type="password"
          ></el-input>
        </el-form-item>
        <!-- 按钮区域 -->
        <el-form-item class="btns">
          <el-button type="primary" @click="login">登录</el-button>
          <el-button type="info" @click="resetLoginForm">重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>

<script>
export default {
  data() {
    return {
      //这是登录表单的数据绑定对象
      loginForm: {
        username: "admin",
        password: "123456",
      },
      //这是表单的验证规则对象
      loginFormRules: {
        //验证用户名是否合法
        username: [
          { required: true, message: "请输入用户名", trigger: "blur" },
          {
            min: 3,
            max: 10,
            message: "长度在 3 到 10 个字符",
            trigger: "blur",
          },
        ],
        //验证密码是否合法
        password: [
          { required: true, message: "请输入用户名", trigger: "blur" },
          {
            min: 6,
            max: 15,
            message: "长度在 6 到 15 个字符",
            trigger: "blur",
          },
        ],
      },
    };
  },
  methods: {
    //点击重置按钮，重置登录表单
    resetLoginForm() {
      //console.log(this)
      this.$refs.loginFormRef.resetFields();
    },
    login() {
      this.$refs.loginFormRef.validate(async (valid) => {
        if (!valid) return; //如果valid为false，直接return，不发起请求
        const { data: res } = await this.$http.post("login", this.loginForm);
        if (res.meta.status !== 200) return this.$message.error("登录失败");
        this.$message.success("登录成功");
        //console.log(res);
        //把登录成功之后的token保存到客户端的sessionStorage中
        window.sessionStorage.setItem("token", res.data.token);
        //通过编程式导航跳转到后台主页，路由地址是 /home
        this.$router.push("/home");
      });
    },
  },
};
</script>

<style Lang="less" scoped>
.login_container {
  background-color: #2b4b6b;
  height: 100%;
}
.login_box {
  width: 450px;
  height: 300px;
  background-color: #fff;
  border-radius: 3px; /* 圆角 */
  position: absolute; /* 绝对定位 */
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%); /* 镜像位移 */
}
.avatar_box {
  height: 130px;
  width: 130px;
  border: 1px solid #eee; /* 边框线 */
  border-radius: 50%; /* 让logo变成圆角 */
  padding: 10px; /* 内边距 */
  box-shadow: 0 0 10px #ddd; /* 阴影，向外扩散10像素 */
  position: absolute;
  left: 50%;
  transform: translate(-50%, -50%); /* 50%是根据盒子的高度即130px的一半 */
  background-color: #fff;
}
.logo {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  background-color: #eee;
}
.btns {
  display: flex;
  justify-content: flex-end; /* 居右对齐 */
}
.login_form {
  position: absolute;
  bottom: 0; /* 距离底部对齐 */
  width: 100%;
  padding: 0 20px; /* 上下0，左右20 */
  box-sizing: border-box; /* 处理边框溢出问题 */
}
</style>